Indicating depth gauge



y 20, 19 3. M. R. DAGQE 2,324,998

INDICATING DEPTH GAUGE Filed! Jan. 23, 1942 2 Sheets-Sheet .1

gjvwwwbom MAX I2. DAGUE,

July 20, 1943. M. R DAGUE 2,324,998

INDICATING DEPTH GAUGE Filed Jan. 23, 1942 2 Sheets-Sheet '2 MAX R.DAGUE Patented Julyr20, 1943 INDIQA'IING nil-23in avan Ma it Qaei e; Agr

Firesteee T156 .1

Ollie es imer ter' q e Rubber l 09mm Mien a e iioret in of Ol ieApplication a uary 23, 194-2, 533m 1510;427971 ohis n i n at te'leeeeesene al e morespecifical-ly it relates '7 to indicating d epth es vv 1 nm er t i et th in eniiee e des in the v ion O e. depth gau eiieiiteq' 'vue ly nd eei bo p us we m nus, ri t ns from e Preee r nee q eih m asement Aeether ebie i e pro id impr s! mean er the r eeu e enei t s enheee e e i t ee aug members and impre sl means .i r'ihe elim n t n f hekfle h there etw en- A fur h r eeieet is re prev de i pro es mean ier threes et en :e me em i ireiiiieslidehly meun e ine eeter rest i9 e isuaiieieeti s ievice. "1

t ll ther Qbieets seen as the eenerelimmo eme en s mpl fieefien e 'ine efine viees e see or ere efv heebeve p p sesw l beeem apparen t9 personssk lle in. the art the Qe qrin ie preeee s.

Inthesirewings;

Fi hews in perspec e indi a es h vi e he nv n ion in erpe e eie' WW1?fleein measured s ewri in 'ireeme te 'y .seletiee- .Fig- 2 is a plan ofth device "eiifie .1 with pa ts bre sen was eillust eteieieriqeenstmeties:

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51s taken alehe 1 s 5,-;5 ;fi

a T e cleviee ine iiiie beer o ame whi h serve a l vel by resell 92 i selenei v hQWP-i base su face llyenslrnrn i' es means i9.

so t lend pesitie me o a iiie time gau e toeethe with associated mechanim late 16- S1'ib,ed,. Th devic i ustra ed inhe i e e n end w ll be thisese beelit rigiinvdelS pesi ion- Frame It i pr viiiesi ith e e tiee l3,dewmya si to a ,Pe nt near obese u fa ,II. but paces th reebe e- Aredeee i here, 1 leads. i em her 1.4 ihreuen besesei her ce s to e setserew later e eribeiiu Awesher 2 posi ioned att e beitem he eyfl t9reste en e nuier .s eulee lee-tween Pe es M. @119 1 A- sle ve 2! isnugly is esee in :bere 14 w h i bettnm end engaging Wa e 2 sa d ve vepridi e e li iieway tor h .bet emees eta 11 drieel plug 2.3.. 3. 1 .923 ee iiedr ei peitie 2.4 in bearing ie'letien with the weiis 9i here vJ4the port on beingprevicled ii ei ietrie'sle 25 having a purposehereinafter described; Plug a e we! essilee s r u e i' i eeter inrespect t6 portion 2'4, hearing relation with sleeve 1L Aboveplug'portion 24, extenqs a reduced cylindrical portion 26 and a furtherretiu ced cylindrical portion 111. Pl-q g portion 2iis encompassed by ahelical spring-2'8 d ispose d within po e u intermediate pm 'porn ri 3gand a.

guide bearing Z Sthat has a cs' li'r'njrieal portion *30 within the boreand a radially flanged portion 3| ela mpegi to fran esurface H 'byrneanspf screws 82. fipring 28 is maintained Within the bore u n dercompression' to urge lug 13 downwardly.

elongated plug 23, 'sligialply giis poseq in rspegtto the frame H! asabove descrihedji s centrally bored to receive the indicator rod IBWhich 7 maybe adji stably clarnped in respect-thereto by means of acollet'sl. The plug portions'are provideo. with center boresof varyingdiameter-l nt interconnect-ed. Rod 'H} is in sl u fi-t relation to pingportion 26. Upperpor-tion g1, provided with a centerhore' of substantialsize to define an elongated chamber in which is glisposegi'a splitendcollet ey-lingier 3M1, having at each end an annular glamp'jaw 3 5, 36the ripper end of phi-g portion 2'! bing'threaded to receive a colletnpt fl for clamping cylinder between the-an- ;nular jaws ang'intloengagement with'j'od l8.

Frame H) is suitably channeled at to receive bellcranl; 4!, pivoted atliif with anarm 43 provided :with an arcua-te terminus 44 engaging theslot wall of plug -23, and a second armat substantially a right angletherefrom with an arcuate terminus portion 46 engaging a slidable aetwating pin 41 of qial type indicator +2, clamped by means of a suitablesupport 4;! to a reduced base portion 4-9 of frame {0; Supper-t isapertured at 50 to receivexthe meter shank and harsh split portioneo-ntraotible by set screws Wafer clamping engagement the-reyirith. I

read, th t its use is ne ee firiee e any sane here I xtend n irem a uP ep ene esi fee 7 An adjustment screw Hex-tends through a siiital'qleborewithin their-name and is proizided. with a lustre-conical end'portionadapted to engage with the upper wall of 51013 25. Screw'52 has a shankportion isthreadingly engagingthe havi g oii set enlar ement H t permitere-" the device mnstbe so adjusted that rod iiLwhen clamped to plu'gwfimust be moved against-the "urge oi compression-spring to 'showga zeroframe, and ahadiu stinent-knob 54 the outer end. of said threaded shank.A helical spring 55 is maintained-under compression within the bore toprevent the screw ire-m working out of adjnstment during lse. Operationof the device is as follows: Since the indicator is adapted to registerplus or minus variations from a predetermined depth,

reading on the indicator I2. While the indicator may be set fromdimensions taken from one piece of work to determine the dimensions ofother work in respect thereto, it is general practice to obtain apredetermined setting of rod Hi from a master shoulder gauge of anyknown type.

To obtain the desired setting of the device, collet nut 38 is firstloosened and rod I8 is extended from base portion ll of frame In theproper distance as determined by the particular shoulder gauge employed.With rod la in the proper position, collet nut 38 being loose, andadjustment screw 52 being disengaged from the slot wall of plug 23, theindicator is put under tension as follows. Knob 54 is rotated to bringthe frustro-conical end of screw 52 into engage ment with the slot wallof plug 23 to force the plug upwardly against the compression of spring28 and turn bellcrank 4| in counterclockwise direction as shown inFigure 3 whereby to actuate o operation may alter the meter reading,hence dial I2 is of the type wherein the face is rotatably adjustablethrough an annular rim 60 after screw 52 hasbeen withdrawn fromengagement with plug 23, but before rod I8 is removedfrom the shouldergauge or other setting means. Then the face of dial I2 is preferablyadjusted to indicate zero reading by the arrow 6|. The master shouldergauge is then removed and when the indicator isplaced on work to bemeasured, rod I8, must therefore be urged downwardly by spring 28 when alike measurement is taken, due to the above setting of the device, andhence both positive and negative variations from the predeterminedsetting, and within certain limits the work will be directly registerable onthe dial.

Set screw 57 provides means for varying the extent to which plug 23 maymove downwardly under the urge of spring 28. This adjustment insuresobtaining the propertension of plug 23 and pin 41 on the bell-crank armsduring use of the device, the force of spring 28 being likely todecrease'with use.

I claim:

1. A depth indicator having in combination, a

rigid frame provided with a planate surface and a bore extending fromsaid surface through the frame, a plug disposed within the bore inbearing relation therewith, means confining the movement of said plug toa path terminating at one end in spaced relation to the planate surface,said plug having a chambered terminus extending from the frame at aposition opposite the planate surface, said chamber leading into areduced center bore extending through the plug, an indicating rodextending through said chamber and center bore, a collet cylinderdisposed within said plug chamber to encompass said rod, a pair 'ofannular clamping jaws disposed within said chamber at opposite ends ofsaid cylinder, a collet nut threadedly engaging the extending plugterminus for releasably clamping the indi cator rod to the plug throughsaidcollet mechanism, said plug having a portion between the chamberedportion and the opposite end directly engaging the walls of said boreand provided with a diametric slot having upper and lower walls inradial planes, an adjustment pin slidably disposed within the frame andhaving frusto-conical end angageable with one of said radial slot walls,a compression spring urging the pin out of engagement with said wall,and a screw for forcing the pin against the urge of said spring, saidframe provided with a channel leading to the slotted plug portion at apoint opposite said pin, a bell crank pivotally mounted within saidframe channel, said bell crank having an arm provided with an arcuateterminus extending into the plug slot and abutting the sidewall oppositethe pin engaging sidewall, and a second crank arm angularly disposedrespecting the first crank arm and provided with an arcuate terminus,and a visual indicator mounted on the frame and having a plunger inabutment with the arcuate terminus of said last mentioned arm.

2. In a depth indicator, the combination with a frame having a planatesurface and a guideway extending through the frame and opening to saidsurface, of a plug like element slidably disposed within the guideway,spring means urging said element toward the planate surface, meansconfining movement of the element through a path terminating in spacedrelation to the planate surface, an adjustment member carried by theframe to engage the plug and limit movement thereof, in opposition tosaid spring means, to ward the planate surface, an indicator mounted onthe frame'at a point spaced from the plug, said indicator being operablethrough a plunger,

and a connector element, pivoted to the frame,

with an arm abutting said plunger and a second arm abutting aportion ofsaid plug-like element, whereby sliding movement of the latter withrespect to the frame is translated to the indicator.

3. In a device for visually indicating minor depth variations, both plusand minus, in a work piece, the combination with a frame having aplanate surface adapted to abut the work piece adjacent a depression tobe measured, an elongated member slidably disposed within an associatedguideway'at right angles to said planate surface, adjustment meansadapted normally to constrain movement of said slide element atselective positions in spaced relation to said planate surface, meansbiasing said element toward the planate surface, an indicating rodextending through the slide element and frame, and means for adjustablyclamping said rod to said element.

4. In a depth indicator, the combination with a rigid frame providedwith a planate work-contacting surface and a guideway disposed in rightangular relation thereto, of a transversely slotted plug slidablydisposed in said guideway with one end. projecting from the frameopposite the planate surface, an indicating rod extending axiallythrough the plug and the guideway, 21. collet carried within the plug atthe projecting end thereof to effect adjustable locking of the rod'inengagement with the plug, a compression spring confined between theframe and plug to urge the plug toward the planate surface, a visualindicator mounted on the frame in spaced relation to the guideway, saidindicator having an actuating element extending therefrom, a bell crankmounted on the frame and having a radial arm abutting the said actuatingelement and a second radial arm circumferentially spaced therefrom, withits outer end engaging said plug within the plug slot, andv adjustmentmeans carried bythe frame for engagement with the plug, whereby tovariably limit movement of said plug in respect to the frame underimpetus of said a rigid frame provided with a planate base, and

spring. a

5. In a depth indicator, the combination with a rigid frame providedwith a planate surface, a plug element mounted to slide in respect tothe frame in right angular relation to said planate surface, adjustmentmeans for determinately varying the normal proximity of the plug withrelation to the said surface, an indicating rod projecting through theplug element, means for adjustably locking the rod in respect to theplug element, an indicating meter mounted on the frame in spacedrelation to the plug element, and a connector pivotally mounted on theframe for operative associationwith the plug element and with the meter.

6. A depth indicator comprising a rigid frame, an elongated rod inslidable relation thereto, spring means urging said rod in one directionrespecting said frame, adjustment means limiting the normal position ofsaid rod under im-' petus of said spring, a bell-crank pivoted to theframe and having a pair of radial arms one of which operativelyassociates with the rod, and an indicating device mounted on the framein a position for operative association with the other bell crank arm,whereby slidable movement of the rod in respect to the frame istransmitted to said indicating means.

'7. A depth indicator having in combination,

a vertical bore extending from the basethrough the frame, said framebeing provided with a chamber disposed laterally of said bore andcommunicating therewith, a visual indicator mountbore for operationthrough a path terminating upwardly of said base, said plug beingprovided witha slot chamber to receive the bore disposed end of the bellcrank arm, said plug being center bored to receive an elongatedindicator rod extending therethrough to project below the base and intoa depression to be measured, the upper end of said plug being chamberedto receive rod engaging collet mechanism operative through a nutthreadedly engaging the upper end of the plug and thereby to'providelocking engagement between the rod and the plug, a compression springconfined within said bore to urge the plug downwardly, and a plugadjusting pin axially movable relatively of the frame and having an endportion extending into said plug slot and adjusting means at itsopposite end for moving it into and out of said slot.

, MAX R. DAGUE.

